The Picard group of a $K3$ surface and its reduction modulo $p$

Published 10 Jun 2010 in math.AG | (1006.1972v1)

Abstract: We present a method to compute the geometric Picard rank of a $K3$ surface over $\bbQ$. Contrary to a widely held belief, we show it is possible to verify Picard rank $1$ using reduction only at a single prime. Our method is based on deformation theory for invertible sheaves.

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